Daniel Smith Luminescent watercolors, unlike anything ever seen in watercolor, simulate the glitter of a watery surface or the luster of mother-of-pearl. They're made from mica pigment, thin transparent particles coated with highly reflective metal oxides. Interference pigments display a subtle sheen when used on white paper. Used on black paper, or as a glaze over dark colors, Interference Copper is a transparent and sparkling soft copper.